Attempting to add additional a trsuted device credential fails.
You have reached the maximum number of enabled credentials. Remove a credential and try again.
Users are allowed 5 credentials and 20 registered devices. If a credential is removed from a user, that credential is put into a deleted state and not reused, but remains with that user for a period of time and may affect the total allowed. From VIP Manager, remove unecessary credentials from the user.
If this does not resolved the issue, contact technical support for addition assistance.